ponty
commented
12 years ago All back-ends work in my test.
Host: Linux 2.6.35-32-generic-pae Ubuntu i686 GNU/Linux Guest: xubuntu-10.04.2-desktop-i386.iso Virtualbox: 4.1.4.14
You may have a virtualbox or video driver problem, try to test on a different computer or change video settings (turn off video acceleration).
Performence test is integrated in pyscreenshot, check the documentation. (http://ponty.github.com/pyscreenshot/speed.html)
My best result for a small window: 0.06 s using wx, which is 15FPS
If you need better performance try to port the wx back-end code to a C++ extension module.
Pyscreenshot is only a wrapper, and performence is not a goal for this project.
jlettvin
I need this for a python magnifier and markup app I am writing. All backends implemented by pyscreenshot fail.
I have spent almost a week trying to ferret out any workable method from google searches. The various commands (gnome-panel-screenshot, xwd, ksnapshot, scrot, shutter, etc...) all fail to deliver anything but an entirely black image (sometimes with mouse cursor) except one.
I discovered exactly one way that works now when using pygtk. I window.hide() all windows, and gtk.gdk.flush(), then $ import -crop 128x128+0+0 -window root screenshot.png # Example sizing
It is not satisfying because it takes about 1.2 seconds to deliver even a small window like the above. I would prefer to do real-time acquire/magnify/display (>20FPS).
I have code implementing this and more (if anybody's interested). I use pygtk and pycairo to create a transparent window through which I see what I want. No method I have discovered will capture that content directly. So I calculate exactly where the window is, hide it, use the 'import' command, unhide the window, then manipulate the image created by the import command to fill the window. Very inelegant, but I see no recourse.
Please help with a higher performance way to fetch the image.